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Share Capital - Summary of Granted Share Options (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, Granted | 1,112,779 | 1,229,689
Officers and employees [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | 4,426,237 | 3,655,020
Share options, Granted | 1,112,779 | 1,229,689
Share options, Exercised | (338,989) | (376,160)
Share options, Forfeited | (212,485) | (82,312)
Share options, end of the year | 4,987,542 | 4,426,237
Weighted Average Exercise Price, Share option, beginning of the year | $ 29.84 | $ 28.33
Weighted Average Exercise Price, Share option, Granted | 32.98 | 31.75
Weighted Average Exercise Price, Share option, Exercised | 20.40 | 21.09
Weighted Average Exercise Price, Share option, Forfeited | 31.49 | 31.57
Weighted Average Exercise Price, Share option, end of the year | $ 31.11 | $ 29.84

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_d&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2018-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2018-03-16 + Details
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